title: Neutron scattering and crystal field studies of the rare earth double perovskite Ba2ErSbO6.
abstract: The rare earth double perovskite Ba(2)ErSbO(6) contains an ordered face-centred cubic lattice of Er(3+) ions, suggesting that this material is a candidate for showing the effects of geometric magnetic frustration. Crystal field effects have also been shown to be important in this series. We report a systematic experimental study involving neutron scattering and bulk measurements that show no evidence of long ranged magnetic order or spin glass freezing down to 70 mK. A description of the system in terms of a crystal field scheme is established from inelastic neutron scattering. These measurements rule out significant magnetic coupling and show that all observed properties are fully explained by a model of uncoupled magnetic Er(3+) ions.
authors.affiliation: London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK. s.calder@ucl.ac.uk
authors.forename: S
authors.initials: S
authors.lastname: Calder
authors.forename: T
authors.initials: T
authors.lastname: Fennell
authors.forename: W
authors.initials: W
authors.lastname: Kockelmann
authors.forename: G C
authors.initials: GC
authors.lastname: Lau
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava
authors.forename: S T
authors.initials: ST
authors.lastname: Bramwell